Polyisothianaphthene, a new conducting polymer
CA 1248690 A · Owner: The Regents Of The University Of California · Inventors: Wudl, Fred; Kobayashi, Masao; Heeger, Alan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymer having an isothianaphthene structure represented by the formula (Ia) and/or (Ib): and/or, (Ia) (Ib), wherein R1 and R2 each represents a hydrogen atom or a hydrocarbon residue having 1 to 5 carbon atoms such as methyl, methoxy and thiomethyl, with the proviso that R1 and R2 may link together to form, along with the benzene ring, a fused ring which is naphthalene; X is sulfur selenium, or tellurium; Y- represents an anion of an electrolyte; z represents a number from 0.01 to 1 showing a ratio of the anion per mol of a monomer; and n represents a number of from 5 to 500 showing a degree of polymerization. An electrochromic display wherein a high molecular weight conductive membrane …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 10, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 10, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.